Question

aplique o teorema de tales:
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Answer 1

Resposta:

$a)\frac{2}{4} =\frac{3}{x}$ ➳ $2.x=3.4$ ➳ $2x=12$ ➳ $x=12/2$ ➳ $x=6$

$b) \frac{4}{12} =\frac{x}{21}$ ➳ $x.12=4.21$ ➳ $12x=84$ ➳ $x=84/12$ ➳ $x=7$